What’s Vulnerable › Vulnerabilities

CVE-2018-4254

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-01-11 · updated 2026-06-17
• Weakness: CWE-20

Description

In macOS High Sierra before 10.13.5, an input validation issue existed in the kernel. This issue was addressed with improved input validation.

Affected products

• macOS: before 10.13.5 — fixed in 10.13.5

How to fix

Upgrade to a fixed version: macOS 10.13.5. Check the vendor advisory for mitigations.

References

• https://support.apple.com/HT208849
• https://support.apple.com/HT208849

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